X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fudev.c;h=6cc718ea4614f9da6e7110fd9901144c5f37fb7c;hp=b1a25b3e639925ee753b53ad4830c9db75e2a7ba;hb=70907c3fc4b344d00ce900e6a536e9cc16a35216;hpb=c70e102425ecc261dc9fa740ce7e2296c5d39f4e

diff --git a/discover/udev.c b/discover/udev.c
index b1a25b3..6cc718e 100644
--- a/discover/udev.c
+++ b/discover/udev.c
@@ -25,6 +25,12 @@
 #include "pb-discover.h"
 #include "device-handler.h"
 #include "cdrom.h"
+#include "devmapper.h"
+
+/* We set a default monitor buffer size, as we may not process monitor
+ * events while performing device discvoery. systemd uses a 128M buffer, so
+ * we'll do the same here */
+static const int monitor_bufsize = 128 * 1024 * 1024;
 
 struct pb_udev {
 	struct udev *udev;
@@ -36,11 +42,15 @@ static int udev_destructor(void *p)
 {
 	struct pb_udev *udev = p;
 
-	udev_monitor_unref(udev->monitor);
-	udev->monitor = NULL;
+	if (udev->monitor) {
+		udev_monitor_unref(udev->monitor);
+		udev->monitor = NULL;
+	}
 
-	udev_unref(udev->udev);
-	udev->udev = NULL;
+	if (udev->udev) {
+		udev_unref(udev->udev);
+		udev->udev = NULL;
+	}
 
 	return 0;
 }
@@ -64,13 +74,21 @@ static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
 		const char *name)
 {
 	struct discover_device *ddev;
+	unsigned int i = 0;
 	const char *typestr;
 	const char *uuid;
 	const char *path;
 	const char *node;
 	const char *prop;
 	const char *type;
-	bool cdrom;
+	const char *devname;
+	const char *ignored_types[] = {
+		"linux_raid_member",
+		"swap",
+		"LVM2_member",
+		NULL,
+	};
+	bool cdrom, usb;
 
 	typestr = udev_device_get_devtype(dev);
 	if (!typestr) {
@@ -85,12 +103,16 @@ static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
 
 	node = udev_device_get_devnode(dev);
 	path = udev_device_get_devpath(dev);
-	if (path && (strstr(path, "virtual/block/loop")
-			|| strstr(path, "virtual/block/ram"))) {
+	if (path && strstr(path, "virtual/block/loop")) {
 		pb_log("SKIP: %s: ignored (path=%s)\n", name, path);
 		return 0;
 	}
 
+	if (path && strstr(path, "virtual/block/ram")) {
+		device_handler_add_ramdisk(udev->handler, node);
+		return 0;
+	}
+
 	cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
 	if (cdrom) {
 		/* CDROMs require a little initialisation, to get
@@ -102,12 +124,28 @@ static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
 		}
 	}
 
+	/* If our environment's udev can recognise them explictly skip any
+	 * device mapper devices we encounter */
+	devname = udev_device_get_property_value(dev, "DM_NAME");
+	if (devname) {
+		pb_debug("SKIP: dm-device %s\n", devname);
+		return 0;
+	}
+
 	type = udev_device_get_property_value(dev, "ID_FS_TYPE");
 	if (!type) {
 		pb_log("SKIP: %s: no ID_FS_TYPE property\n", name);
 		return 0;
 	}
 
+	while (ignored_types[i]) {
+		if (!strncmp(type, ignored_types[i], strlen(ignored_types[i]))) {
+			pb_log("SKIP: %s: ignore '%s' filesystem\n", name, type);
+			return 0;
+		}
+		i++;
+	}
+
 	/* We may see multipath devices; they'll have the same uuid as an
 	 * existing device, so only parse the first. */
 	uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
@@ -116,7 +154,7 @@ static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
 		if (ddev) {
 			pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
 					name, uuid, ddev->device->id);
-			return -1;
+			return 0;
 		}
 	}
 
@@ -129,10 +167,21 @@ static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
 	prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
 	if (prop)
 		ddev->label = talloc_strdup(ddev, prop);
-	ddev->device->type = cdrom ? DEVICE_TYPE_OPTICAL : DEVICE_TYPE_DISK;
+
+	usb = !!udev_device_get_property_value(dev, "ID_USB_DRIVER");
+	if (cdrom)
+		ddev->device->type = DEVICE_TYPE_OPTICAL;
+	else
+		ddev->device->type = usb ? DEVICE_TYPE_USB : DEVICE_TYPE_DISK;
 
 	udev_setup_device_params(dev, ddev);
 
+	/* Create a snapshot for all disks, unless it is an assembled RAID array */
+	if ((ddev->device->type == DEVICE_TYPE_DISK ||
+	     ddev->device->type == DEVICE_TYPE_USB) &&
+	    !udev_device_get_property_value(dev, "MD_LEVEL"))
+		devmapper_init_snapshot(udev->handler, ddev);
+
 	device_handler_discover(udev->handler, ddev);
 
 	return 0;
@@ -258,23 +307,18 @@ static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
 {
 	struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
+	struct udev_list_entry *list;
+	const char *name;
 
-#ifdef DEBUG
-	{
-		struct udev_list_entry *list;
-		const char *name;
-
-		list = udev_device_get_properties_list_entry(dev);
-		name = udev_device_get_sysname(dev);
+	list = udev_device_get_properties_list_entry(dev);
+	name = udev_device_get_sysname(dev);
 
-		pb_debug("%s: action %s, device %s\n", __func__, action, name);
-		pb_debug("%s properties:\n", __func__);
+	pb_debug("udev: action %s, device %s\n", action, name);
+	pb_debug("udev: properties:\n");
 
-		for (; list; list = udev_list_entry_get_next(list))
-			pb_log("\t%-20s: %s\n", udev_list_entry_get_name(list),
-					udev_list_entry_get_value(list));
-	} while (0);
-#endif
+	for (; list; list = udev_list_entry_get_next(list))
+		pb_debug("\t%-20s: %s\n", udev_list_entry_get_name(list),
+				udev_list_entry_get_value(list));
 
 	if (!strcmp(action, "add"))
 		return udev_handle_dev_add(udev, dev);
@@ -317,11 +361,6 @@ static int udev_enumerate(struct udev *udev)
 
 	list = udev_enumerate_get_list_entry(enumerate);
 
-	if (!list) {
-		pb_log("udev_enumerate_get_list_entry failed\n");
-		goto fail;
-	}
-
 	udev_list_entry_foreach(entry, list) {
 		const char *syspath;
 		struct udev_device *dev;
@@ -355,6 +394,12 @@ static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
 		goto out_err;
 	}
 
+	result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
+	if (result) {
+		pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
+			monitor_bufsize);
+	}
+
 	result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
 		NULL);
 
@@ -387,10 +432,8 @@ static int udev_process(void *arg)
 	struct udev_monitor *monitor = arg;
 	struct udev_device *dev;
 	const char *action;
-	int result;
 
 	dev = udev_monitor_receive_device(monitor);
-
 	if (!dev) {
 		pb_log("udev_monitor_receive_device failed\n");
 		return -1;
@@ -400,17 +443,12 @@ static int udev_process(void *arg)
 
 	if (!action) {
 		pb_log("udev_device_get_action failed\n");
-		goto fail;
+	} else {
+		udev_handle_dev_action(dev, action);
 	}
 
-	result = udev_handle_dev_action(dev, action);
-
 	udev_device_unref(dev);
-	return result;
-
-fail:
-	udev_device_unref(dev);
-	return -1;
+	return 0;
 }
 
 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
@@ -421,12 +459,13 @@ static void udev_log_fn(struct udev __attribute__((unused)) *udev,
       vfprintf(pb_log_get_stream(), format, args);
 }
 
-struct pb_udev *udev_init(struct waitset *waitset,
-	struct device_handler *handler)
+struct pb_udev *udev_init(struct device_handler *handler,
+		struct waitset *waitset)
 {
+	struct pb_udev *udev;
 	int result;
-	struct pb_udev *udev = talloc(NULL, struct pb_udev);
 
+	udev = talloc_zero(handler, struct pb_udev);
 	talloc_set_destructor(udev, udev_destructor);
 	udev->handler = handler;
 
@@ -434,7 +473,7 @@ struct pb_udev *udev_init(struct waitset *waitset,
 
 	if (!udev->udev) {
 		pb_log("udev_new failed\n");
-		goto fail_new;
+		goto fail;
 	}
 
 	udev_set_userdata(udev->udev, udev);
@@ -443,11 +482,11 @@ struct pb_udev *udev_init(struct waitset *waitset,
 
 	result = udev_setup_monitor(udev->udev, &udev->monitor);
 	if (result)
-		goto fail_monitor;
+		goto fail;
 
 	result = udev_enumerate(udev->udev);
 	if (result)
-		goto fail_enumerate;
+		goto fail;
 
 	waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
 		udev_process, udev->monitor);
@@ -456,16 +495,13 @@ struct pb_udev *udev_init(struct waitset *waitset,
 
 	return udev;
 
-fail_monitor:
-	udev_monitor_unref(udev->monitor);
-fail_enumerate:
-	udev_unref(udev->udev);
-fail_new:
+fail:
 	talloc_free(udev);
 	return NULL;
 }
 
-void udev_destroy(struct pb_udev *udev)
+void udev_reinit(struct pb_udev *udev)
 {
-	talloc_free(udev);
+	pb_log("udev: reinit requested, starting enumeration\n");
+	udev_enumerate(udev->udev);
 }